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for each of the five functions f1-(x,1/y) ,f2-(0,y) ,f3 (x+2y,y) ,f4-(x-2,y+1) ,f5 (x,y^3-y) prove or disprove...

for each of the five functions f1-(x,1/y) ,f2-(0,y) ,f3 (x+2y,y) ,f4-(x-2,y+1) ,f5 (x,y^3-y) prove or disprove that fn is distance-preserving

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